Gels,
Год журнала:
2024,
Номер
10(10), С. 623 - 623
Опубликована: Сен. 27, 2024
As
more
and
mines
utilize
the
cemented
paste
backfill
(CPB)
mining
method,
demand
for
reducing
cost
carbon
footprint
is
increasing
becoming
critical.
In
this
work,
a
new
gel
binder
made
with
40
wt.%
of
low-quality
Class
F
fly
ash
(FCM)
proposed
to
replace
ordinary
Portland
cement
(OPC).
The
hydration
hardening
properties
were
experimentally
investigated
through
X-ray
diffraction,
Mercury
intrusion
porosimetry,
uniaxial
compression,
thermogravimetric
analysis.
Three
different
mine
tailings
used
verify
FCM’s
applicability.
Results
show
that
strength
performance
FCM-CPB
72%
OPC-CPB,
while
FCM
production
almost
less
than
half
OPC.
process
can
be
divided
into
five
stages,
main
products
are
ettringite
gel-like
hydrates.
31.2%
porosity
at
28-day
curing
higher
7-day
curing,
average
pore
size
lower,
structure
denser.
meet
requirement
three
regarding
subsequent
filling
cut-and-fill
methods.
provides
feasible
alternative
economic
environmental
benefits.
Sustainability,
Год журнала:
2024,
Номер
16(11), С. 4393 - 4393
Опубликована: Май 22, 2024
Paste
backfill
mining
is
an
significant
part
of
green
coal
mining,
which
can
improve
resource
utilization
and
extend
the
service
life
mines.
It
important
for
solving
“three
under,
one
above”
problem
avoiding
industrial
wastes
such
as
gangue
fly
ash
that
occupy
farmland
pollute
environment.
To
address
difficult
filling
a
fully
mechanized
top-coal
caving
face
(FMT-CCF),
new
method
partial
paste
herein
proposed.
First,
implementation
steps
FMT-CCF
are
introduced
in
detail.
Then,
mechanistic
model
roof
beam
established.
structural
factors
on
effect
42105
determined.
Dependent
assay
migration
law
overlying
stratum
after
filling,
numerical
simulation
analysis
used
to
research
feature
main
effect.
Finally,
rate,
width,
strength
suitable
obtained.
When
rate
reaches
100%,
alteration
takes
place,
resulting
efficient
decrease
rock
stress
arch
shell’s
height.
As
width
body
expands
from
10
m
at
each
end
20
m,
experiences
maximum
reduction,
specifically
decreasing
by
approximately
14
m.
greater
than
0.4
GPa,
better.
This
study
has
guidance
reference
significance
thick
seam
mining.
Minerals,
Год журнала:
2025,
Номер
15(1), С. 81 - 81
Опубликована: Янв. 16, 2025
Fiber-reinforced
cemented
paste
backfill
(FR-CPB)
has
attracted
considerable
attention
in
modern
mining
applications
due
to
its
superior
mechanical
properties
and
adaptability.
Despite
potential,
understanding
rheological
behavior
remains
limited,
largely
because
of
the
absence
quantitative
methods
for
assessing
fiber
packing
within
CPB.
This
study
develops
a
rheology-based
approach
determine
maximum
fraction
polypropylene
fibers
fresh
CPB,
revealing
that
shorter
(3
mm)
achieve
0.661,
significantly
higher
than
longer
(12
with
0.534.
Building
on
these
findings,
model
static
yield
stress
FR-CPB
was
developed,
showing
under
high
content
(0.9%)
mm),
reached
274.34
kPa,
40%
increase
compared
fibers.
Additionally,
modeled
time-dependent
evolution
stress,
achieving
prediction
accuracy
correlation
coefficient
0.92.
These
advancements
enable
optimization
composition,
which
can
reduce
material
usage,
enhance
pipeline
transport
efficiency,
improve
stability
underground
voids.
By
minimizing
risk
structural
failure
optimizing
resource
allocation,
this
research
provides
theoretical
foundation
safer
more
cost-effective
operations.
Minerals,
Год журнала:
2025,
Номер
15(2), С. 97 - 97
Опубликована: Янв. 21, 2025
The
backfill
binder
material
is
the
key
to
cost
and
performance
of
cemented
paste
backfill.
This
study
aims
understand
current
situation
metal
ore
binders,
identify
industry
challenges,
inspire
research
ideas,
explore
development
directions.
Current
investigates
trends
developments
binders
through
literature
review,
experience
summary,
field
research,
statistical
analysis,
other
methods.
Firstly,
main
types
are
summarized,
including
cement,
metallurgical
slag,
thermal
chemical
tailings
binders.
Secondly,
progress
regarding
reactivity
activation,
hydration
mechanism,
harmful
ion
solidification,
energy
conservation,
carbon
reduction
summarized.
Thirdly,
three
industrial
applications
new
introduced
Cement
still
most
common,
followed
by
slag
powder
binder.
cases
steel
semi-hydrated
phosphogypsum
have
shown
significant
effects.
Solid
waste-based
materials
gradually
replacing
which
a
trend.
Finally,
further
discussed,
modeling
simulation,
properties
under
extreme
environments,
hardening
process
control,
technical
standards
for
work
provides
reference
basis
promoting
green
efficient
sustainable
development.
